Grating



' 35 customary, the tops of thebentor-spaeerhars Il A are substantially flush with the topsof the straghtbars III. `Asisusual,the Y Alatenti 17,11%35Y MLM,-

Gnmc l Y armani, N. Y., assigner to- Kedow Steel Ebel-Ing o., Jersey. City, N. J., a eorporationolicw Jersey Y ap Andi 3.1935, serai N0. 14,393

l 12 am (ci. lss-sz) This invention relates to gratings sich as are used for iiooring and other purposes, and has for its object to provide a simple and inexpensive meansfor reinforcing and splicing' sections of One suggestion :for splicing the ends of the grating sections together has contemplated, some of the straight bars and some of the spacing bars in each section being longer than others, in order that the-grating sections may overlap longitudinally, at least-in part. Instead of such a construction, it has been discovered that-sections oi grating may be spliced without being longitudinally overlapped, by the use of an additional splicing section of grating. Slch an expedient is de-= sirable because it minimizes the change in appearance or conguration oi the gratings, and also.

.strengthens the spliced portions.

Referring to the drawing: Fig. 1 is a top plan view of one this invention. f i A Fig. Zisa sectionontheline22 ofFig. 1. Fig. 3 is a top plan view of a modified form of spacing members for use in the lower or splicing in order that the'` bent members may be substantially alined with the bent members in the superposed gratings.

Fig.4isasection onthelinel-loflgl. A portion of a Agrating section -9 comprises the usual straightbars I9 and anumber ofspaceror bent bars II arranged between the straight bars in a conventional manner. From Fig. 2 it will be embodiment of apparent that the siraight-'bars 'Il are substanrtially deeper than'the bent bars II, and as is fastened to the straight bars il` by spot welding or riveting, or other fastening means.

To assist in supporting the over end portion of the grating 9, another grating I2 is provided with its ends supported as shown in Fig. 2. This second Vsecion is similar to the rst in-that it is comprised of straight-bars I3, andspacer bars il of the same shape'as the spacer bars Il of the A salient diii'erencebetween the rst and second grating resides in the second grating being inverted with respect to the rst, thatrris the bent bars Il are arranged with theirf bottom edges iiush withY the bottom edges of the straight bars I3. 111e portions of-the straight bars III and I3 noten the same level with thelbent bars, are overlapped in depth as shown in Fig. 4, and these overlapped portions of the straight Il and I3 are secured together by spot welds I5, or equivalent fastening means. Any convenient number of such spot welds I5 may be used. As shown in Fig. 2,-the straight bars I3 have their end portions shaped to rest on the beams I6 and Il, v5 which support the superposed gratings. As shown in Eg. 4, the grating I2 acts as a support for the grating 9, not only by means of the spot welds I5 but also because the straight bars I3 may have their tops contiguous the bottom edges of the 10 bent bars il, or the bottom edges of the straight bars III may rest on the top edges of the spacer bars Il inorder that the grating I2 may directly support the 'overhanging end ofthe grating 9.

A third grating I9 may also be arranged with 15 its end substantially contiguous the end ofV the grating 9, the grating I9 being supported in a similar manner to that described for the grating -Sl "The grating I9 is similar in construction to i the grating 9, being comprised ofv straight bars 20 and bent spacer bars '2I. The adjacent ends of the gratings 9 and I9 are shown as being sub- Y stantially contiguous at the spliced joint 22 in` rig. 1.

From Fig. l it will be seen that the bent spacer bars of the' lower or splicing grating are not in Y Y direct vertical alinement with the corresponding bars in the superposed grating sections, due to the vertical barsbeing lapped as shown in Fig. 4.

` In order that the bent bars in the grating I2 may 30 posed gratings 9 and I9, the spacer bars Ma may have a slightly modied shape as shown in Fig. 3 in the grating section 12a. Itwill be understood 35 that the portions of the spacer bars contiguous the stralghtbars |3a will not be in direct alinement with the corresponding portions of the spacer bars. in the superposed gratings, but the inclined portions of the spacer bars Ila may be 40 in perfect alinement with' the inclined portions f of thesuper'posed sections, whichis not true in Figs. 1 and 2.

Where the ends of the grating I2 are. supported `as illustrated, the grating section I2 constitutes 45 a strengthening and splicing means for the overhanging end portions of4 the gratings 9- and I9. The grating I2 reinforces and supports the adja.- cent .ends of the gratings 9 and I9, even ifthe spot welds between the straight bars- I3 and the 50 straight bars III and 20 be omitted, because the bottom edges of the bars of al superposed section rest on the top edges of the bars of the lower section. The splicer section of grating I2 is'of the same construction as the superposed sections, ex-

la tween the spacing bars oteachgrating.

cept for the notched end portions of the straight ,bars I3 restingonthebeams "and I1. Theu'se of standard grating construction for all three sec- Y tions and the elimination of any unusual shape 5 to theend portions of the gratings is a feature deserving attention in this invention. ,The lower grating'l2 has its spacer bars I4 nearly vertically alined with the spacer barsll` and 2|`in the su- Derposed sections as shown in Figs. l and 2'so lo' that the appearance, design and configuration of the grating is maintained. vThe splicer section I2 is fastened only to the lapped portions of the straight bars. In addition to its use as illusjtrated, the lower grating I2 may have its ends is unsupportedexcept by the overlying grating or this grating 'I2 may befastened intermediate the ends of a long superposed grating to stillen it and increase its resistance to bending. In other lword-3, When the lower grating I2 is secured int termediate the ends of an overlying grating, the ends of the grating I2 need not necessarily'be supported. The grating I2 acts as a reinforcing 'unit, not only because of the straight bars I3;

but also due to the strengtheningk eii'e'ct of the 8 5 spacer bars Il. Where a iioor is -iilled'with concrete, for example, the reinforcing grating I2 in li'ig.` l substantially 'eliminates any negative bending moment. which mightcause the concrete to `crackover a supporting beam. The 30 splicersection Ilmaybesecuredtooneof its superposed sections in the factory, making it necessary onlyforit tobesecuredto theothersuperposed section at the place of installation, or, if

desired,thisgratingl2mayaisobesecuredto` I boththegratingslandllattheplaceofinstailation, since it is Aa relatively 'simple matter to secure the overlapped portions of the. straight bars by spot welds or. rivets. 'lo'assis't in vertically alining the spacer bars of bo'th'the upperv 40 and Vlower sections, guide holes for a rivet may' be provided in the lamd straight bars at the factory.

'rnc splice .or this invention 'is desirable for gratings when the same are used-as walkways,

46 Ibridge doors, vehicular 'floors and. for armoring concrete, in f act the upper and lower gratings of Fig. 2, for example, may be iilled to any depth with concrete or other cementitious' The construction of this invention is cheaper,

V50. simpler and stronger than some of the previousways of splicing grating sections. The construction comprises no hinge' joints and the straight -bars of the splicing'grating can be made as deep as desired, so'that even greater strength is ob- 55 'taihable in the reinforced portion."While. the

spacing bars are shown as being bent. it'will be understood that' such spacing bars may be of any shape desired, whether bent or straight.

The straight bars Il in the lower grating have l) their end portions of reduced-depth as shown byv the numeral II, where such ban rest on the supports-II and i1.

I claim:

1. In a metal grating comprising a plurality` C5 of straight bars, spacing bars secured between the straight bars and of less depth-than the straightl l bars but having their top edg' substantially flush with the tops of the straight bars, the improve ment which comprises another metalgrating having straight bars and spacing bars, the s'econd grating being inverted with' respect to the first Vmentioned grating and having the straight bars of .the second grating lapped in deptlrad fastened to the straight bars of the first grating bespanning the ends.of the '2. In a metal mungeoniprmng a plmnty,

of straight bars, spacing-bars secured between the s'treight' bars and o f less depth than the straight bars but having their top edges'substantially yflush with the tops of the straight bars, the 5 improvement which' comprises another metal gratinghaving straight bars and spacing bars, v

.the second grating being' inverted with 'respect to the first 4mentioned grating and having the straight bars' of the second'grating lapped in,l0

3. In a metal grating comprising .a .plurality of straight bars, spacing barssecured between the straight bars and of less depth than the straight bars but having their top edges substantially`I flush with the tops of the straight bars, the improvement which comprises another metal grating having straight bars and spacing bars, the' second grating being inverted with respect to the '25 rst mentioned grating and having' the straight bars of the second grating lapped in depth with the straight bars of the first grating between the' spacing bars of each grating, said. second mentioned grating extending well beyond an end of the first mentioned grating for supporting such end and an end portion of a third grating,

. the end of which is adjacent the'end of the first grating,r said lsecond mentioned grating having its endportions provided with supports. 35

4. In a metal grating comprising a plurality of straightbars, spacing barssecuredbetweenthe straight' bars and of less depth than the straight bars but having ltheir top edges substantially 'num' with or the straight bars, the 1m- 4o' provement which comprises another metal grating having straight bars andb spacing bars, the second grating being inverted with respect to the' first mentioned grating and having the straight .barsofthesecondgratinglappedindepthwith45 respect to. the straight bars of the rs't grating l and` between the spacing bars of each grating,

said second mentioned grating extending beyond an end of'the' iirst mentioned gratingfilpports Y for e'aeh end of. the second grating, one set of bars 50. in the second grating supporting another set of bars in the iirstgra 5.In a metal grating 'a" plurality I A of straight bars, bars secured between' the straight .bars of less d'epththan the 5,5 straight bars their. top edges substanamy num with the wps or the straight-:bara another grating havingan end substantially con-ltiguous ah end of the ilrst grating,and aplu- 'rality otstraight supported at each end and, .lappedindepth belowthespacing'barsofthe nrst and second gratings and secured to and straight bars of the 6. I nametal grating comprisingapluralityot 06 straight bars, spacing bars'secured between tbe. straight bars and of less depth than the straight l bars but having their top-edges substantially iiush with the -tops of the straight bars, the im- 'provement which comprises another metal grat- 70 ing having straight bars and spacing bars, the

, second grating being inverted with respect to the rst mentioned grating and having the straight bars of the second grating lapped in depth and fastened zo the Astraight han; of me 'nsvv V nrst grating between the spacing bars o1' each grating, the spacing bars of the second grating being substantially vertically alined with the spacing bars of the first grating to preserve the design and appearance ofthe iirst grating.

7. In a metal grating comprising a plurality of straight bars, spacing bars secured between the straight bars and of less depth than the straight bars but having their top edges substantially flush with the tops of the straight bars, the improvementv which comprises another metal grating having straight bars and spacing bars, the second grating being inverted with respect to the first mentioned grating and having the straight bars of the second grating lapped in depth and fastenedto the straight bars of the 'rst grating betweenthe spacing bars of each grating, the

, spacing and straight bars of the secondgrating muy nsh with the tops of the straight bars, the

' being out of vertical alinement with the corresponding bars of the first grating. by an amount no greater than their thickness. 8. In a metal grating comprising a plurality of straight bars, spacing bars secured between the straight bars and of less depth than the straight bars but having their top edges substan tially ush with the tops of the straight bars, the improvement which comprises .another metal grating having straight bars and spacing bars, the second grating being inverted with respect to the iirst mentioned grating and having the straight bars of the second grating lappedin depth with respect to the straight bars of the first grating and between the spacing bars of each grating, said second mentioned grating extending beyond an end of the iirst mentioned grating, supports for e'ach end of the second grating, the spacing bars of the second grating constituting a support for the straight bars of the first grating.

9. In a metal grating comprising a plurality of straight bars, spacing bars secured between the straight bars and of -less depth than the straight bars but having their top edges substanimprovement which comprises another metal grating having straight bars and spacing bars, the second grating being inverted with respect to the first mentioned grating and having the straight bars of the second grating lapped in depth with respect to the straight bars fo! the rst grating and between the spacing bars of each grating, said second mentioned 4grating extending beyond an end of they ilrst mentioned grating, supports for each end of the second grating, the straight bars of the second grating constituting a direct and contiguous support for the spacing bars of the iirst grating.

10. In a metal grating comprising a plurality 5 of straight bars, spacing bars secured between the straight bars and of less depth than the straight bars but having their top edges substantially ush with the tops of the straight bars, the

improvement which comprises another metal la grating having straight bars and spacing bars, the second grating being inverted with respect to the ilrst mentionedv grating and having 'the straight bars of the second grating lapped in depth and fastened to the straight bars of the rst grating between the spacing bars oi.' each grating, the spacing bars of the second grat#- ing being substantially vertically alined with 'the spacing bars `of the iirst grating to preserve the design and appearance of the irst grating,

the spacing bars of the rst grating being bent with substantially equal longitudinal portions lthereof lying contiguous one of its adjacent straight bars, and longitudinal portions thereof lying contiguous the other of its adjacent straight bars, but the longitudinal portions of each spacing bar contiguous one straight bar being of less length than the corresponding portions adjacent the other contiguous straight bar.

1i. A metal grating comprising straight bars, 30 and a bent spacer bar between each adjacent pair of straight bars, the bent spacer bars being shaped to lie contiguous the straight bars fora short distance, such contiguous portions of the bent spacer bars on opposite sides of the straight bars being longer on one side than on the other side thereof.

12. In a metal grating comprising a plurality of straight bars, spacing bars secured between the 

